Piston and cylinder construction



NV- l 1949- J. H. scHRElBl-:R 2,486,615

PISTON AND CYLINDER CONSTRUCTION Filed April 25, 1948 35 g3 32 /7 A 45 l/f/fvroe" l/ JOHN f 5C/@5556 38 j), 9g

Patented Nov. 1, 1949 2,486,615 PIS TON:v AND; CYLINDER CONSTRUCTION John H.4 Schreiber, St. Louis,Y Mo., assignor to Liviingai'm Inc.,. St'. Louis, Mo.,` a corporation.

ApplicatonADril 2,*3, 1948, Serial N0; 22,934

The present invention relates generallyA to piston and` cylinder mechanisms, andmore particularly toa hydraulic. pistonl andi cylinder mechanism having a power takeoi. proj ecticn extending through` the sidef of the cylinder'. rather than from one of the ends thereof.

The present device is a further develonmentof my piston and cylinder mechanism disclosed and claimed in my copending applications.. Serial. No. 726.923, led Il'ebruarvy 6. 1947.,l and. Serial:l No. 738l10'7,.led- March. 29;. 19457..Y

An obiectof the present inventiorr is to prof vide a novel piston; andA cylinder 'construction of the side power takeoff type:

Another. object is; to prox/idea noveipiston and cylinder construction` in. whichv afmetal casing is provided which is. splitlongitudinally which enclosesv an internal coextensive lining of plastic material formed toA seal the longitudinal split of the casing, in which is disposed al plastic: piston towhich is securedapower takeoff which incor porates mechanism forV applying' fluid under pressure intoy the lined casing' atthe'. ends of. the internally disposed'. plastic piston".

Another: object is to: provide' a novel'piston and cylinder construction' of theVy side power takeoff' type in which means is provided4 for maintaining the cylinder sealed against leakage' ot powernuid.

Other4 objects. are toprovide: aznovel piston and cylinder construction ofthe type mentioned. which is efficient-in operation` which is relativelyv inexpensive tofabricate. which is` positive: in action in respect to thea sealing device for the longitudinal ofpeningv in the cylinder. which; 11e--A quires minimum maintenance,` and,.hence^,. islow 3" in operationalcostand which finds-wideadaptartion.

The foregoing and? other objects and advantages are apparent from the following description taken with the accompanyingl drawing. in which:

Fig. 1 is a side elevational View of a piston and cylinder construction formed in accordance with the teachings of the present invention;

Fig. 2 is a central longitudinal cross-sectional view taken on substantially the line 2-2 of Fig. 1;

Fig. 3 is a longitudinal cross-sectional view taken on substantially the line 3-3 of Fig. 1 showing the cylinder in bottom plan view;

Fig. 4 is an enlarged vertical cross-sectional view on substantially the line 4-4 of Fig. 3;

Fig. 5 is an enlarged transverse cross-sectional view on substantially the line 5-5 of Fig. 1;

Fig. 6 is an enlarged transverse cross-sectional view on substantially the line 6-6 of Fig. 1; and

5 Claims. (Cl. 121-1).

Fig; '7 is an enlarged crossfsectional. view ofV a fragment of one of the plows.

Referring to the drawing more. particularlyby reference numerals, I0 indicates.A generally a piston and cylinder construction incorporating the teachings of the present invention, which in,- cludes an exterior casing I2 of. metal. or other form retaining material; (Fig. 69, an inner 1111- ing I4l of pliablezmaterial, suchv asv rubber, or the like, and a power takeoff mechanism I6.

The cylinder` I2, in a preferred formt. is; of the crosslsection shownf in Figs. 5 and 6, andincludes two identical halves I,'I,. eachv having a ange IS. secured to each other by suitable: nut and bolt assemblies I9. Between theanges I8 is: a web 2| of the lining I4. The casing I2 is formedy with a longitudinal opening 22 opposite the. secured flanges I 8. At each` end of the. casing If2is1a head" 23 secured thereto. by suitable bolts 24 there being a gasket 22E-between each head.` 23- and the end of the casing I2 for sealing. purposes.

The lining I4r is of substantially' thefsame. cross section as the casing I2 and includesea longitudeV inal` slit 2'I opposite. the longitudinali opening 22; The slit 2I is closed by contact of the adjacent end surfaces of the lining I4 foroedzintdengaging relation by pressure in thecasing I2` and'. by a piston described below. As is. clear from` Fig.r 2, the lining I4 is coextensivewith the casing I2.

Within the lining I4 is a piston 30 of yieldable material, such as hard rubber, or thev like, the length of which, in respect tothe length of. the casing I 2, being dependent upon the job to be performed by the present construction Ill. The

power takeoffv mechanism I6- is supported by the piston. 3D. The mechanism I6 includes` a` pair of` plows 32, each oi which is` formed of. a pair of spaced plates 33 and 34. The plates. 33A and 34. arebevelled at the ends aty 35. and. 3.5 respectively, and include between them at, each end a plate 31 bevelled to provide a plow point 38 (Fig. '7) which preferably are brazed together to form a unitary piece. At its inner side edge, plates 33 and 34 are formed with a channel 39 which eX- tends outwardly from the outer edge thereof, as is clear from Figs. 4, 5 and 6. When the two plates 33 and 34 are assembled, the opposed channels 39 form a conduit 40. The two pairs of plates 33 and 34 are engaged along the outer sides by two strips 43 and 44, a sealing and spacer strip 45 being disposed between the opposed plates 33 and 34 and preferably brazed thereto to form a unitary construction (Fig. 6). Suitable nut and bolt assemblies 46 maintain the strips 43 and 44 in place during brazing and may then be removed. Suitable openings 48 are provided through the strip 43 and suitable openings 49 are provided through each of the plates 33 for the introduction of uid into the space between the plates 33 and 34. A fitting 5I! is mounted in each of the openings 48.

Operation The assembly of the present piston and cylinder construction I is manifest from the foregoing. It is clear that the plows 32 separate the lining I4 at the slit 21 as the piston 30 is moved in either direction and the trailing edges of the plows 32 permit ready resealing of the lining I4 without loss of any operating fluid within the casing I2 and lining I4.

The piston is moved in either direction by the introduction of fluid under pressure into the spaces at the ends thereof. It is palpable that operating fluid is introduced through the fittings and passes` between the respective plates il and 34 into the channel 40 and thence into the end of the construction IB desired. Itis, of course, understood that the ttings 58 are connected into a suitable supply of liquid under pressure, and that the necessary manual or automatic valves are provided for reciprocating the piston and power takeoff mechanism I6 as required.

It is obvious that there has been provided a piston and cylinder construction which fullls the objects and advantages sought therefor.

The power takeoff mechanism I6 may be employed as a mechanical means to receive power for reciprocating said piston 30 if desired, as, for example, for pumping purposes.

It is to be understood that the foregoing description and the accompanying drawing have been given by way of illustration and example. It is also to be understood that changes in form of the elements, rearrangement of parts, and substitution of equivalent elements, which will be obvious to those skilled in the art, are contemplated as within the scope of the present inven-V tion which is limited only by the claims which follow.

' What is claimed is:

1. Hydraulic piston and cylinder construction comprising a cylinder including a form retaining casing having an open longitudinally extending slit therein, means normally closing said slit, and a piston disposed in said cylinder having a power takeoi connected thereto and extending through the slit of said casing, said power takeoff including plows separating said slit closing means and being in sealing relation therewith, said plows being formed as fluid passages for introduction of operating fluid into and removal from said cylinder.

2. Hydraulic piston and cylinder construction comprising a cylinder including Aan outer casing of form retaining material, said casing having a longitudinal open slit therein, a lining in said casing coextensive therewith including a normally closed slit opposite the open slit of said casing, a piston in said cylinder, and a power takeoff secured to said piston and extending through both of said slits, said power` takeol including plows in sealing relation with and for opening said lining slit as the piston is actuated and for permitting said lining slit to close after passing a point.

3. Hydraulic piston and cylinder construction comprising a cylinder including an outer casing of form retaining material, said casing having a longitudinal open slit therein, a lining in said casing coextensive therewith including a normally closed slit opposite the open slit of said casing, said lining at each side of the slit being inwardly directed to form a V with the juncture at the slit so that internal pressure exerts a slit closing effect, a piston in said cylinder, and a power takeoi secured to said piston and extend ing through both of said slits, said power takeoff including plows in sealing relation with and for opening said lining slit as the piston is actuated and for permitting said lining slit to close after passing a point.

4. Hydraulic piston and cylinder construction comprising a cylinder including a casing of form retaining material, a longitudinal open slit in said casing of predetermined length, a lining within said casing of resilient material having a normally closed slit aligned with the open slit of said casing, said lining conforming to the internal shape of said casing, a piston in said cylinder,

a power takeoff secured to said piston and including a portion extending through and adapted to ride in said lining and casing slits, and means for introducing operating pressures into the casing at opposite ends of said piston to reciprocate the same and to maintain said lining slit sealed. 5. Hydraulic piston and cylinder construction comprising a cylinder including a casing of form retaining material, a longitudinal open slit in said casing of predetermined length, the casing wall adjacent and delning said slit being directed inwardly, a lining within said casing of resilient material lhaving a normally closed slit aligned with the open slit of said casing, said lining conforming to the internal shape of said casing, a piston in said cylinder, a power" takeoff secured to said piston and including a portion extending through and adapted to ride'in said lining and casing slits, and means for introducing operating pressures into the casing at opposite ends of said piston to reciprocate the same and to maintain said lining slit sealed.

JOHN H. SCHREIBER.

No references cited 

